Core-top calibration of the alkenone index vs sea surface temperature in the Indian Ocean

Sonzogni, Corinne; Bard, Édouard; Rostek, Frauke; Lafont, Raymond; Rosell‐Melé, Antoni; Eglinton, G.

doi:10.1016/s0967-0645(97)00010-6

Cited by 74 publications

(72 citation statements)

References 37 publications

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“…Purified lipid extracts of between 1.5 and 5 g of freeze-dried and homogenized sediment samples were analyzed for alkenone concentrations using an Agilent 6850 gas chromatograph (GC) equipped with a split-splitless inlet system, a silica column (30 m × 0.25 µm film thickness × 0.32 mm ID; HP-1; Agilent), and a flame ionization detector (310 • C). Alkenone unsaturation ratios were translated into sea surface temperature using the core top calibration for the Indian Ocean of Sonzogni et al (1997b):…”

Section: Alkenonesmentioning

confidence: 99%

“…In our compilation, temperature reconstructions from the eastern and southeastern Arabian Sea are based on Mg / Ca ratios of planktonic foraminifera (see methods in, e.g., Govil and Naidu, 2010;Mahesh and Banakar, 2014;Saraswat et al, 2013;Tiwari et al, 2015) except core MD90963, which has alkenone temperatures . All other records are alkenone temperatures calculated with the core top calibration of Sonzogni et al (1997b). Using the published age models, we averaged the temperature records available from the northern, western, eastern, and southeastern Arabian Sea and for the Oman and Somali upwelling systems (Fig.…”

Section: Integration and Averaging Of Sst And δ 15 N Reconstructionsmentioning

confidence: 99%

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Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

et al. 2018

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Abstract. At present, the Arabian Sea has a permanent oxygen minimum zone (OMZ) at water depths between about 100 and 1200 m. Active denitrification in the upper part of the OMZ is recorded by enhanced δ 15 N values in the sediments. Sediment cores show a δ 15 N increase during the middle and late Holocene, which is contrary to the trend in the other two regions of water column denitrification in the eastern tropical North and South Pacific. We calculated composite sea surface temperature (SST) and δ 15 N ratios in time slices of 1000 years of the last 25 kyr to better understand the reasons for the establishment of the Arabian Sea OMZ and its response to changes in the Asian monsoon system. Low δ 15 N values of 4-7 ‰ during the last glacial maximum (LGM) and stadials (Younger Dryas and Heinrich events) suggest that denitrification was inactive or weak during Pleistocene cold phases, while warm interstadials (ISs) had elevated δ 15 N. Fast changes in upwelling intensities and OMZ ventilation from the Antarctic were responsible for these strong millennial-scale variations during the glacial. During the entire Holocene δ 15 N values > 6 ‰ indicate a relatively stable OMZ with enhanced denitrification. The OMZ develops parallel to the strengthening of the SW monsoon and monsoonal upwelling after the LGM. Despite the relatively stable climatic conditions of the Holocene, the δ 15 N records show regionally different trends in the Arabian Sea. In the upwelling areas in the western part of the basin, δ 15 N values are lower during the mid-Holocene (4.2-8.2 ka BP) compared to the late Holocene (< 4.2 ka BP) due to stronger ventilation of the OMZ during the period of the most intense southwest monsoonal upwelling. In contrast, δ 15 N values in the northern and eastern Arabian Sea rose during the last 8 kyr. The displacement of the core of the OMZ from the region of maximum productivity in the western Arabian Sea to its present position in the northeast was established during the middle and late Holocene. This was probably caused by (i) reduced ventilation due to a longer residence time of OMZ waters and (ii) augmented by rising oxygen consumption due to enhanced northeast-monsoon-driven biological productivity. This concurs with the results of the Kiel Climate Model, which show an increase in OMZ volume during the last 9 kyr related to the increasing age of the OMZ water mass.

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Section: Alkenonesmentioning

confidence: 99%

Section: Integration and Averaging Of Sst And δ 15 N Reconstructionsmentioning

confidence: 99%

Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

et al. 2018

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“…These biomarkers are produced by cosmopolitan haptophyte algae (Emiliani huxleyii and Gephyrocapsa oceanica) in the ocean and can be preserved in sediments for millions of years (Volkman et al, 1980;Rontani et al, 1997;Sonzogni et al, 1997). The degree of unsaturation of C 37 alkenones (U alkenone unsaturation index has become an indispensable tool for paleoceanographic research (Müller et al, 1998;Lawrence et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Climatic and environmental controls on the occurrence and distributions of long chain alkenones in lakes of the interior United States

Toney

Huang

Fritz

et al. 2010

Geochimica et Cosmochimica Acta

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“…Growing concerns about specific proxies for continental palaeotemperature and progress in the alkenone proxy for palaeo sea surface temperature (e.g., Volkman et al, 1980;Marlowe et al, 1984;Brassell et al, 1986;Prahl et al, 1989;Sikes et al, 1991;Conte et al, 1992;Rontani et al, 1997;Sonzogni et al, 1997;Herbert et al, 1998;Mü ller et al, 1998;Teece et al, 1998;Prahl et al, 2000;Epstein et al, 2001;Harada et al, 2006;Zhao et al, 2006) 0146-6380/$ -see front matter Ó 2007 Elsevier Ltd. All rights reserved. doi:10.1016All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

Sun¹,

Chu

Liu

et al. 2007

Organic Geochemistry

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Core-top calibration of the alkenone index vs sea surface temperature in the Indian Ocean

Cited by 74 publications

References 37 publications

Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification

Climatic and environmental controls on the occurrence and distributions of long chain alkenones in lakes of the interior United States

Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

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